diff --git a/.gitignore b/.gitignore
index 002795b..e10e0ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,4 +12,6 @@ nohup.out
 
 raw_eater.cpp
 
+cyt/*.cpp
+
 *.o
diff --git a/lib/raweat.hpp b/lib/raweat.hpp
index ef8a5ab..bdf253a 100644
--- a/lib/raweat.hpp
+++ b/lib/raweat.hpp
@@ -83,6 +83,27 @@ public:
     this->setup_and_conversion(showlog);
   }
 
+  raw_eater()
+  {
+
+  }
+
+  // provide/set new raw file
+  void set_file(std::string rawfile)
+  {
+    std::cout<<"raw_eater::set_file "<<rawfile<<"\n";
+    // set file
+    rawfile_ = rawfile;
+
+    // reset arrays
+    datasec_.clear();
+    segments_.clear();
+    datmes_.clear();
+
+    // do setup and conversion
+    setup_and_conversion(true);
+  }
+
   // set up and conversion
   void setup_and_conversion(bool showlog)
   {
diff --git a/lib/rawmerge.hpp b/lib/rawmerge.hpp
index 1bcb777..f86bbd5 100644
--- a/lib/rawmerge.hpp
+++ b/lib/rawmerge.hpp
@@ -21,16 +21,24 @@ private:
   // number of channels
   int num_channels_;
 
-  // (merged) channel data
+  // (merged) channel data related to SINGLE time series
   std::vector<std::vector<double>> channels_;
+  std::vector<double> timeseries_;
 
-  // channel meta data
+  // temporal unit and channel meta data
+  std::string temp_unit_;
   std::vector<std::string> channel_names_;
 
 public:
 
   // constructor
   raw_merger(std::string rawfile): raw_eater(rawfile)
+  {
+    // add first initial channel
+    this->add_channel(rawfile);
+  }
+
+  raw_merger(): raw_eater()
   {
 
   }
@@ -44,17 +52,92 @@ public:
   // add a single channel and its associated time series
   bool add_channel(std::string rawfile)
   {
-    return true;
+    // set raw file and perform conversion
+    this->set_file(rawfile);
+
+    // add first/initial time series (and channel data)
+    if ( timeseries_.size() == 0 && channels_.size() == 0 )
+    {
+      std::cout<<"adding first channel\n";
+      // insert timeseries and its unit
+      timeseries_ = this->get_time();
+      temp_unit_ = this->get_temp_unit();
+
+      // insert channel data and its meta data
+      channels_.push_back(this->get_data());
+      channel_names_.push_back(this->get_name() + std::string(" [")
+                             + this->get_unit() + std::string("]"));
+
+      return true;
+    }
+    else
+    {
+      // TODO check consistency of time series, time unit, channels....
+      return false;
+    }
   }
 
   // print all data to file
   void write_table(std::string filename, char delimiter = ',', int precision = 6, int width = 25)
   {
+    // if at least one channel including its time series is present
+    if ( timeseries_.size() > 0 && channels_.size() > 0 )
+    {
+      // open file
+      std::ofstream fout(filename.c_str());
 
+      if ( fout.good() )
+      {
+        // define temporal column header
+        std::string colTime = std::string("Time [") + temp_unit_ + std::string("]");
+
+        // write header
+        if ( delimiter != ' ' )
+        {
+          fout<<colTime;
+          for ( std::string chnam: this->channel_names_ ) fout<<delimiter<<chnam;
+        }
+        else
+        {
+          fout<<std::setw(width)<<std::right<<colTime;
+          for ( std::string chnam: this->channel_names_ ) fout<<std::setw(width)<<std::right<<chnam;
+        }
+        fout<<"\n";
+
+        // write actual time and channel data
+        unsigned long int tidx = 0;
+        for ( double ti: this->timeseries_ )
+        {
+          if ( delimiter != ' ' )
+          {
+            fout<<std::fixed<<std::dec<<std::setprecision(precision)<<ti;
+            for ( std::vector<double> chn: this->channels_ )
+            {
+              fout<<delimiter<<std::dec<<std::setprecision(precision)<<chn[tidx];
+            }
+          }
+          else
+          {
+            fout<<std::fixed<<std::dec<<std::setprecision(precision)
+                <<std::setw(width)<<std::right<<ti;
+            for ( std::vector<double> chn: this->channels_ )
+            {
+              fout<<std::fixed<<std::dec<<std::setprecision(precision)
+                  <<std::setw(width)<<std::right<<chn[tidx];
+            }
+          }
+          fout<<"\n";
+
+          // count number of samples
+          tidx++;
+        }
+
+        // close file
+        fout.close();
+      }
+    }
   }
 
-
-
 };
 
 #endif
diff --git a/pyt/example.py b/pyt/example.py
index 5ac83cc..d3cd827 100644
--- a/pyt/example.py
+++ b/pyt/example.py
@@ -15,7 +15,8 @@ for rf in rawlist :
     print("converting " + str(rf) + "...\n" + 90*("-") + "\n")
 
     # setup instance of "raw_eater" and trigger conversion
-    eatraw = raw_eater.raweater(rf.encode())
+    # eatraw = raw_eater.raweater(rf.encode())
+    eatraw = raw_meat.rawmerger(rf.encode())
 
     # check validity of file format
     if eatraw.validity() :
diff --git a/src/main.cpp b/src/main.cpp
index 021d683..4d46824 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -30,7 +30,10 @@ int main(int argc, char* argv[])
   std::string rawfile(argv[1]);
 
   // declare instance of "raw_eater"
-  raw_eater eatraw(rawfile,true);
+  // raw_eater eatraw(rawfile,true);
+
+  // declare instance of "raw_merger"
+  raw_merger eatmea(rawfile);
 
   //eatraw.show_markers();
 
@@ -58,8 +61,10 @@ int main(int argc, char* argv[])
 //  for ( unsigned long int i = 0; i < 10; i++ ) std::cout<<mydata[i]<<"\n";
 
   // write data in csv-file
-  eatraw.write_table(std::string(argv[2]));
+  // eatraw.write_table(std::string(argv[2]));
   // eatraw.write_table(std::string(argv[2]),' ');
+  // eatmea.write_table(std::string(argv[2]));
+  eatmea.write_table(std::string(argv[2]),' ');
 
   return 0;
 }